Pettibone will have exploratory surgery on his right shoulder Tuesday. Orthopedist James Andrews will perform the surgery. The Phillies did not put a timetable on Pettibone’s recovery, but it’s extremely doubtful he will pitch again this season. He has not pitched since May 12 at Triple A Lehigh Valley.

Pettibone made 18 starts in the big leagues last season but was shut down with shoulder soreness for the final two months of the season. He spent the fall rehabbing the injury and has experienced two setbacks since the start of spring training.

An MRI performed last month revealed that Pettibone had a small tear in his labrum, a cartilage structure inside the shoulder. He attempted to rehab the injury for a month, but finally had to give in to surgery.